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Poly(ethylenimine) (PEI) has been known as an efficient gene carrier with the highest cationic charge potential. High transfection efficiency of PEI, along with its cytotoxicity, strongly depends on the molecular weight. Synthesis of cationic copolymers derived from the low molecular weight of PEI and hydrophilic poly(ethylene glycol) (PEG), which are water soluble and degradable under physiological...
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